Stay-bolt



J; NIXON" (No Model.)

sTAY BoLT.

Patented Aug. 8; 1893;

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. wmvsssea I Wax UNITED STATES PATENT-7' OFFICE.

I JOSEPH NIXON, OF ALTOONA, PENNSYLVANIA.

STAY! BO LT.

SPECIFICATION forming part of Letters Patent No. 502,827, dated August8, 1893. Application filed February 21, 1893. Serial No. 463.208. (N0model.)

To all whom it may concern.

Be it known that'I, JOSEPH NIXON, a citizen of the United States,residing at Altoona, in the county of Blair, in the'State ofPennsylvania, have invented a certain new and useful Improvement inStay-Bolts, of which the following is a true and exact description,reference being had to the accompanying drawings, which form'a part ofthis specification;

Myinvention relates to a mode of securing stay bolts, particularly. insteam boilers, and to a sleeve, into which the bolt is secured in such amanner that the breakage of bolts and the danger resulting therefrom aregreatly lessened, if not entirely overcome. It is well known that staybolts,particularly the short ones used to stay thefurnace walls ofboilers, are very apt to become fractured, because of the great strainsto which they are exposed on account of the unequal expansion of thewalls in which they are secured, and because these bolts are short, andcannot give and accommodate themselves to the varying positions of thewalls as they expand. These fractures in the stay bolts, when suchoccur, are very often close to the boiler walls, as the bolt is bent atthat point over the sharp edge of the boiler walls in which the boltsare secured, and are from such position, very difficult to locate and soa bolt when broken is often not removed when it should be. Thesedifficulties I overcome by securing the stay bolt on one side, so thatits support is independent of and preferably outside of the boilershell, allowing a longer bolt to be used, and forming this support so asto give the belt a support slightly rounded for some portion of itslength so that it will not be bent sharply at any one point. Thissupport is preferably made so that it will break before the bolt, ifVery excessive strains are experienced, which, on account of thebreakage on the outside of the boiler wall and from the construction ofthe bolt support does not impair the strength of the boiler as the boltitself is intact, and the slight leak occasioned, simply serves to warnthe engineer that the bolt support must be replaced.

My invention is illustrated in the accompanying drawings, in whichFigure l is a sectional view of a stay bolt arranged according to myinvention. Fig. 2 is a similar view showing the end of the bolt riveteddown on the sleeve, and Fig. 3 is an end view of the stay bolt sleeve orsupport.

A and A are respectively the outer and inner walls of a boiler and haveholes a, a opposite each other as usual, and threaded as shown at c andhaving a head 0.

B, represents-a support or sleeve for the boiler stay bolt 0. As shown,the sleeve B has a head B, preferably made polygonal, so as to afford agrip for a wrench or like instrument, by which the sleeve is turned, and

has a barrel portion as b. The barrel portion I) is threaded at b toscrew into the bolt to in the wall A and is preferably tapered as shownto make a tight fit. The inside of the barrel is of such a size, that atits inner end near the contracted threaded portion the bolt 0 fitsneatly into the sleeve; from there outwardly, the walls are veryslightly beveled and end in a flaring mouth at b thus afiording abearing for the bolt 0 for a considerable portion of its length, and incase of strains, the bolt is bent over an extended curved surface andfracture is less likely to occur.

In practice the sleeve B is first screwed into the outer wall A. Thenthe hole a in the wall A and the hole b in the sleeve B are both tappedat onetime and with the same 'tool and then the bolt 0 is screwedthrough the wall A into the head B of the sleeve which lies outside ofthe plane of the wall A,

whereby a relatively longer bolt 0 may be used, and the head of the boltmay then be riveted down on the sleeve, as shown at 0 Having nowdescribed my invention, what I claim as new, and desire to secure byLetters Patent, is- I l. The method of securing stay bolts in boilerswhich consists in forming holes a, at opposite to each other in thesheets tobe secured together, screwing a sleeve B in the hole a in oneof the sheets, then tapping the hole a in the other sheet and a hole bin the sleeve at the same time and with the same tool, and

then screwing abolt in the said holes a and b 2. A stay bolt sleeve Bhaving an external thread I) a barrel 6 adapted to fit over the threadsof the bolt and provided with a flared mouth I) and a contracted head badapted to be threaded to engage the bolt,

3. A stay bolt sleeve B having an external tapered thread I) a barrel badapted to fit over the threads of the bolt and provided with a flaredmouth 17 and a contracted head 11 adapted to be threaded to engage thebolt.

4. The combination with plates A, A of a boiler of a sleeve l3 screwinginto the outer plate and having a flaring mouth 1) adapted to clear thebolt and a bolt C screwing into the plate A and into the sleeve B.

5. The combination with plates A, A of a boiler of a sleeve B screwinginto the outer plate and having a flaring mouth 1) adapted to clear thebolt and a bolt 0 screwing into the plate A and into the sleeve B at apoint outside of the plane of the plate A.

6. The combination with plates A, A of a boiler of a sleeve B screwinginto the outer plate and formed with a barrel 1) adapted to JOSEPHNIXON.

Witnesses:

A. J. ANDERSON, HARRY W. ANDERSON.

